Examples of org.apache.hadoop.hbase.client.Delete

org.apache.hadoop.hbase.client.Delete
Used to perform Delete operations on a single row.
To delete an entire row, instantiate a Delete object with the row to delete. To further define the scope of what to delete, perform additional methods as outlined below.
To delete specific families, execute {@link #deleteFamily(byte[]) deleteFamily}for each family to delete.
To delete multiple versions of specific columns, execute {@link #deleteColumns(byte[],byte[]) deleteColumns}for each column to delete.
To delete specific versions of specific columns, execute {@link #deleteColumn(byte[],byte[],long) deleteColumn}for each column version to delete.
Specifying timestamps, deleteFamily and deleteColumns will delete all versions with a timestamp less than or equal to that passed. If no timestamp is specified, an entry is added with a timestamp of 'now' where 'now' is the servers's System.currentTimeMillis(). Specifying a timestamp to the deleteColumn method will delete versions only with a timestamp equal to that specified. If no timestamp is passed to deleteColumn, internally, it figures the most recent cell's timestamp and adds a delete at that timestamp; i.e. it deletes the most recently added cell.
The timestamp passed to the constructor is used ONLY for delete of rows. For anything less -- a deleteColumn, deleteColumns or deleteFamily -- then you need to use the method overrides that take a timestamp. The constructor timestamp is not referenced.


  /**
   * Deletes region from meta table
   */
  private void deleteMetaRegion(HbckInfo hi) throws IOException {
    Delete d = new Delete(hi.metaEntry.getRegionName());
    meta.delete(d);
    meta.flushCommits();
    LOG.info("Deleted " + hi.metaEntry.getRegionNameAsString() + " from META" );
  }

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  /**
   * Reset the split parent region info in meta table
   */
  private void resetSplitParent(HbckInfo hi) throws IOException {
    RowMutations mutations = new RowMutations(hi.metaEntry.getRegionName());
    Delete d = new Delete(hi.metaEntry.getRegionName());
    d.deleteColumn(HConstants.CATALOG_FAMILY, HConstants.SPLITA_QUALIFIER);
    d.deleteColumn(HConstants.CATALOG_FAMILY, HConstants.SPLITB_QUALIFIER);
    mutations.add(d);


    Put p = new Put(hi.metaEntry.getRegionName());
    HRegionInfo hri = new HRegionInfo(hi.metaEntry);
    hri.setOffline(false);

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    }
    if (!servlet.userRequestLimit(user, 1)) {
      return Response.status(509).build();
    }
    servlet.getMetrics().incrementRequests(1);
    Delete delete = null;
    if (rowspec.hasTimestamp())
      delete = new Delete(rowspec.getRow(), rowspec.getTimestamp(), null);
    else
      delete = new Delete(rowspec.getRow());


    for (byte[] column: rowspec.getColumns()) {
      byte[][] split = KeyValue.parseColumn(column);
      if (rowspec.hasTimestamp()) {
        if (split.length == 2 && split[1].length != 0) {
          delete.deleteColumns(split[0], split[1], rowspec.getTimestamp());
        } else {
          delete.deleteFamily(split[0], rowspec.getTimestamp());
        }
      } else {
        if (split.length == 2 && split[1].length != 0) {
          delete.deleteColumns(split[0], split[1]);
        } else {
          delete.deleteFamily(split[0]);
        }
      }
    }
    HTablePool pool = servlet.getTablePool();
    HTable table = null;
    try {
      table = pool.getTable(actualTableName);
      table.delete(delete);
      if (LOG.isDebugEnabled()) {
        LOG.debug("DELETE " + delete.toString());
      }
    } catch (IOException e) {
      throw new WebApplicationException(e, 
                  Response.Status.SERVICE_UNAVAILABLE);
    } finally {

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//            System.out.println("Putting of kvsetsize=" + put.size());
            region.put(put);
            numPutsFinished++;
            if (numPutsFinished > 0 && numPutsFinished % 47 == 0) {
              System.out.println("put iteration = " + numPutsFinished);
              Delete delete = new Delete(row, (long)numPutsFinished-30, null);
              region.delete(delete, null, true);
            }
            numPutsFinished++;
          }
        } catch (InterruptedIOException e) {

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      Append a = new Append(rk.getBytes());
      a.add(cf.getBytes(), appendCol.getBytes(), Bytes.toBytes("-APPEND"));
      hTable.append(a);
  
      Delete dOne = new Delete(rk.getBytes());
      dOne.deleteFamily(cf.getBytes());
      hTable.delete(dOne);
  
      Delete dTwo = new Delete(rk.getBytes());
      hTable.delete(dTwo);
  
      // There should be one multi put where the cf is consistent
      assertTimeVaryingMetricCount(1, TABLE_NAME, cf, null, "multiput_");

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  private void checkRowAndDelete(HTable t, byte[] row, int count) throws IOException {
    Get g = new Get(row);
    Result r = t.get(g);
    assertEquals(count, r.size());
    Delete d = new Delete(row);
    t.delete(d);
  }

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    Scan scan = new Scan();
    scan.setMaxVersions(3);
    // open the first scanner
    RegionScanner scanner1 = region.getScanner(scan);


    Delete delete = new Delete(Bytes.toBytes("r1"));
    region.delete(delete, null, false);
    region.flushcache();


    // open the second scanner
    RegionScanner scanner2 = region.getScanner(scan);

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      more = scanner.next(results);
      if (results != null && !results.isEmpty())
        count++;
      else
        break;
      Delete delete = new Delete(results.get(0).getRow());
      delete.deleteColumn(Bytes.toBytes("trans-tags"), Bytes.toBytes("qual2"));
      r.delete(delete, null, false);
      results.clear();
    } while (more);
    assertEquals("Did not perform correct number of deletes", 3, count);
  }

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      // not empty anymore
      res = region.checkAndMutate(row1, fam1, qf1, CompareOp.EQUAL,
          new BinaryComparator(emptyVal), put, lockId, true);
      assertFalse(res);


      Delete delete = new Delete(row1);
      delete.deleteColumn(fam1, qf1);
      res = region.checkAndMutate(row1, fam1, qf1, CompareOp.EQUAL,
          new BinaryComparator(emptyVal), delete, lockId, true);
      assertFalse(res);


      put = new Put(row1);
      put.add(fam1, qf1, val2);
      //checkAndPut with correct value
      res = region.checkAndMutate(row1, fam1, qf1, CompareOp.EQUAL,
          new BinaryComparator(val1), put, lockId, true);
      assertTrue(res);


      //checkAndDelete with correct value
      delete = new Delete(row1);
      delete.deleteColumn(fam1, qf1);
      delete.deleteColumn(fam1, qf1);
      res = region.checkAndMutate(row1, fam1, qf1, CompareOp.EQUAL,
          new BinaryComparator(val2), delete, lockId, true);
      assertTrue(res);


      delete = new Delete(row1);
      res = region.checkAndMutate(row1, fam1, qf1, CompareOp.EQUAL,
          new BinaryComparator(emptyVal), delete, lockId, true);
      assertTrue(res);


      //checkAndPut looking for a null value

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      boolean res = region.checkAndMutate(row1, fam1, qf1, CompareOp.EQUAL,
          new BinaryComparator(val2), put, lockId, true);
      assertEquals(false, res);


      //checkAndDelete with wrong value
      Delete delete = new Delete(row1);
      delete.deleteFamily(fam1);
      res = region.checkAndMutate(row1, fam1, qf1, CompareOp.EQUAL,
          new BinaryComparator(val2), delete, lockId, true);
      assertEquals(false, res);
    } finally {
      HRegion.closeHRegion(this.region);

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